Pattern Dynamics Simulation of Boiling Two-phase Flow Dynamics

• Project/Area Number: 19360104
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Kansai University
• Principal Investigator: OZAWA Mamoru Kansai University, システム理工学部, 教授 (60112009)
• Co-Investigator(Kenkyū-buntansha): UMEKAWA Hisashi 関西大学, システム理工学部, 准教授 (10232894)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥14,300,000 (Direct Cost: ¥11,000,000、Indirect Cost: ¥3,300,000); Fiscal Year 2008: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2007: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
• Keywords: 熱・物質移動 / 気液二相流 / 離散気泡モデル / 流動様式 / 気泡離散モデル / 二相流ダイナミックス / サブクールバーンアウト / 定電流法 / 熱工学 / モデル化 / 原子力エネルギー / 二相流 / 沸騰熱伝達

Research Abstract

ボイド伝播方程式を基礎式とする離散気泡モデルを発展させ, 垂直上昇流におけるボイド率の時間変動挙動を定常流ならびに流動脈動下に対して数値的に再現するとともに, 同モデルの水平流への拡張を実施した. また, この計算結果を管内径2.0, 3.0mmの水平ミリチャンネル内の作動圧力5.0, 6.5 MPaのCO_2で得られた実験結果と比較し, 従来提案させている流動様式線図よりもよく実験結果を表現でき, 特に管頂部のドライアウトが問題となるSlug-Annular flowを含むIntermittent領域の存在を上手く再現できることを示した.

Research Products

• [Journal Article] Flow pattern and boiling heat transfer of CO2 in horizontal small-bore tubes (2009)
  • Author(s): M. Ozawa, T. Ami, I. Ishihara, H. Umekawa, R. Matsumoto, Y. Tanaka, T. Yamamoto and Y. Ueda
  • Journal Title: International Journal of Multiphase Flow (印刷中)
  • Peer Reviewed
• [Journal Article] Flow pattern and boiling heat transfer of CO2 in horizontal small-bore tubes (2009)
  • Author(s): M. Ozawa, T. Ami, I. Ishihara, H. Umekawa, R. Matsumoto, Y. Tanaka, T. Yamamoto, Y. Ueda
  • Journal Title: International Journal of Multiphase Flow (印刷中)
  • Peer Reviewed
• [Presentation] Flow Pattern and Boiling Heat Transfer of CO2 in Horizontal Small-Bore Tubes (2009)
  • Author(s): M. Ozawa, T. Ami, I. Ishihara, H. Umekawa, R. Matsumoto, Y. Tanaka, T. Yamamoto, Y. Ueda
  • Organizer: US-Japan Seminar on Two-Phase Flow Dynamics
  • Place of Presentation: Santa Monica, U.S.A.
  • Year and Date: 2009-09-16
• [Presentation] 連続するスラグ気泡の相互干渉 (2009)
  • Author(s): 中村典子, 大藪明久, 網健行, 梅川尚嗣,小澤守
  • Organizer: 日本機械学会関西支部 学生員卒業研究発表講演会
  • Place of Presentation: 近畿大学
  • Year and Date: 2009-03-15
• [Presentation] 連続するスラグ気泡の相互干渉 (2009)
  • Author(s): 中村典子, 大藪明久, 網健行, 梅川尚嗣, 小澤守
  • Organizer: 日本機械学会関西支部学生員卒業研究発表講演会
  • Place of Presentation: 近畿大学
• [Presentation] Flow Boiling of Carbon Dioxide in Horizontal Mini-channel and Pattern Dynamics approach to study flow pattern (2009)
  • Author(s): M. Ozawa
  • Organizer: 7th International ASME Conference on Nanochannels, Microchannels and Minichannels
  • Place of Presentation: POSTECH-Pohang University of Science and Technology, Pohang, Korea
• [Presentation] Flow Pattern Prediction of CO2 at High Pressure by Discrete Bubble Model (2009)
  • Author(s): T. Ami, H. Umekawa, M. 0zawa, M. Shoji
  • Organizer: 7th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics
  • Place of Presentation: Jagiellonian Uniersity's Auditorium Maximum Krakow, Poland
• [Presentation] Application of Discrete Bubble Model to Boiling Two-Phase Flow (2008)
  • Author(s): T. Ami, H. Umekawa, M. Ozawa and M. Shoji
  • Organizer: 7th JSME-KSME Thermal and Fluids Engineering Conference
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2008-10-15
• [Presentation] An Application of Discrete Bubble Model to Horizontal Two-Phase Flow (2008)
  • Author(s): T. Ami, H. Umekawa, M. Ozawa, M. Shoji
  • Organizer: 2nd International Forum on Heat Transfer (IFHT-2008)
  • Place of Presentation: Tokyo, JAPAN
  • Year and Date: 2008-09-17
• [Presentation] Flow Pattern and Boiling Heat Transfer of CO2 in Horizontal Small-Bore Tubes (2008)
  • Author(s): M. Ozawa, T. Ami, I. Ishihara, H. Umekawa, R. Matsumoto, Y. Tanaka, T. Yamamoto, Y. Ueda
  • Organizer: US-Japan Seminar on Two-Phase Flow Dynamics
  • Place of Presentation: Lowes Santa Monica Beach Hotel, Santa Monica, U. S. A
• [Presentation] An Application of Discrete Bubble Model to Horizontal Two-Phase Flow (2008)
  • Author(s): T. Ami, H. Umekawa, M. Ozawa, M. Shoji
  • Organizer: 2nd International Forum on Heat Transfer (IFHT-2008)
  • Place of Presentation: Convention Hall. lstitute of Industrial Science, in the Komaba Research Campus of the University of Tokyo, Tokyo, JAPAN
• [Presentation] Application of Discrete Bubble Model to Boiling Two-Phase Flow (2008)
  • Author(s): T. Ami, H. Umekawa, M. Ozawa, M. Shoji
  • Organizer: 7th JSME-KSME Thermal and Fluids Engineering Conference
  • Place of Presentation: Hokkadio Citizens Actibites Center, Sapporo, Japan
• [Presentation] 離散気泡モデルの沸騰工層流への適用 (2007)
  • Author(s): 網・梅川・小澤・庄司
  • Organizer: 日本機械学会熱工学コンファレンス2007
  • Place of Presentation: 京都大学工学部
  • Year and Date: 2007-11-23